Since the publication of a monograph on Isolepis (Cyperaceae) in 2002, further data on the genus have been collected, necessitating additional nomenclatural change. Isolepis is a predominantly southern hemisphere genus with high species diversity in South Africa and Australia. A new combination is made here: Isolepis tenella (L.f.) Muasya & D. A. Simpson, transferring an aberrant annual previously named Cyperus tenellus.